Integral rice or white rice? This comparison seems a nice example to understand that something important happens, aside of perhaps assumptions by logic. There are a lot of myths around there, but also enough evidence to conclude that both aliments, integral and white rice, provide a different level of blood glucose after being ingested, the measurable glycemic index.
The question is why, as integral rice is no more than encapsulated white rice. The industry uses a refining process for eliminating that exterior shell, giving the characteristic grain. Even, polished, because a specific machine does this in several factories.
If those studies are based in quantity, of course 100 grams of integral rice —versus the refined counterpart— account with the shell and its nutrients, although the ratio cannot increase the results until that point. Some sources cite that the available fiber in the aliment must be subtracted from the total sugars, to calculate the total that the organism is going to process. Others say something similar, talking about accessibility to the organism, thus white rice is more "ready" to be processed than white rice.
The important aspect to remember is how white rice, or say also refined sugar, white bread or other refined products, create more pronounced glucose peaks. Also, another man-made actions like peeling or squeezing fruit. Several companies, accused of sugar abuse in their products remember the high levels of glucides in natural juices, and it's at a first glance true! It doesn't happen when you eat the entire fruit.
Any organism has billion pieces and another high quantity of factors of dynamic interaction, and each one is different. Nonetheless, today the consensus about these assumptions exists, and the interrelated disease affects millions.
The mechanism for blood glucose stabilization involves the pancreas and insulin, a hormone produced there. When there's a peak toward high, this hormone is released with the purpose of equilibrating the level. The problem is how the organism could develop a form of resistance to this mechanism. The scientific sector affirms that this is a direct consequence of high peaks of the glycemic index during large periods of time, so the insulin, finally, after the abuse, loses its efficiency in a form of tolerance.
A good reason to look up those tables with the glycemic indexes, and focus other habits if you were walking on dangerous ground.